Brightness estimates of supernovae based on studies of all pictures available and using the same reference stars.


4.Apr 1999 = Julian day ( JD ) 2451272.5
Brightness calculation
( Ignore Rmags - sign )
SN1999cb in Mrk 881 ( New Ho = 72(km / s) / Mpc ---> 391*10^6 l.y. )

Absolute peak brightness ( x Sun ) : 5.9*10^9 Peak brightness : JD 51285 Half brightness : JD 51297 Number of days : 12 Source : Images on David Bishop's SN1999cb Sub page Reference stars, USNO-A2.0 Rmags

SN1999el in NGC 6951 ( Old Ho ---> 100*10^6 l.y. ) Source : Images on David Bishop's SN1999el Sub page
Reference stars, USNO-A2.0 Rmags


The peculiar type-Ia SN2000cx in NGC 524 ( Old Ho ---> 150*10^6 l.y. )

Absolute peak brightness ( x Sun ) : 10*10^9 Peak brightness : JD 51754 Half brightness : JD 51765 Number of days : 11 Source : Images on David Bishop's SN2000cx Sub page Reference stars, USNO-A2.0 Rmags

Main Astronomical Index.